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SubjectRe: [RFC v2 4/4] btrfs: verify symlinks with append/immutable flags
On Thu, May 10, 2018 at 04:13:59PM -0700, Luis R. Rodriguez wrote:
> The Linux VFS does not allow a way to set append/immuttable
^^^^^^^^^^

Typo, in all 3 patches.

> attributes to symlinks, this is just not possible. If this is
> detected inform the user as the filesystem must be corrupted.
>
> Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
> ---
> fs/btrfs/inode.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index c4bdb597b323..d9c786be408c 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -3933,6 +3933,15 @@ static int btrfs_read_locked_inode(struct inode *inode)
> inode->i_op = &btrfs_dir_inode_operations;
> break;
> case S_IFLNK:
> + /* VFS does not allow setting these so must be corruption */
> + if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) {
> + ret = -EUCLEAN;
> + btrfs_crit(fs_info,
> + "corrupt symlink with append/immutable ino=%llu root=%llu\n",

no "\n" and please un-indent the string so it fits 80 columns.

> + btrfs_ino(BTRFS_I(inode)),
> + root->root_key.objectid);
> + goto make_bad;

I found some error handling issues, before the switch, there's
btrfs_free_path and there's one more at the make_bad label.

To fix that, please set path = NULL after the first btrfs_free_path, it
can handle a NULL when it's called again.

Next thing I'm not sure about are the ACLs that get initialized in some
cases. There's cache_no_acl() that only resets the inode::i_acl and
inode::i_default_acl, so I think this should be called too. Thanks.

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